On 02/23/2015 12:54 PM, Tobias Ellinghaus wrote:
Hi!
>> 1) I am trying to get detailed information about the metadata management
>> of darktable. the user manual gives no information at all. This is
>> critically important if one wishes to interact with image collection
>> management software, e.g. digikam. Where can one obtain this information?
>
> Currently metadata handling is sub par in darktable, I meant to improve the
> situation since a long time and hope to get that done before 2.0 is due. I am
> not sure what kind of documentation you want about that though, there isn't
> mus to be said, is there?
Probably, the OP is hoping for stuff like how to include a vocabulary,
how to handle it, how one can get keyword chains working if there's
something like keyword groups (automatically assign a bunch of kws in
one go; can be faster to delete some after that) and some hidden tricks
how to work effectively with what one can spot at first glance.
I was also searching where IPTC has gone and especialy location
information there (location, sublocation, country, city e.g.) dt is so
much better in all other areas that you really think you missed the
hidden manuals when it comes to metadata.
Just to encourage you to have a look at those modules. Would be greatly
appreciated!
>> In addition I have some specific questions:
>>
>> 2) It looks like the metadata are stored as IPTC attributes. Is there
>> any interaction between EXIF and IPTC attributes, e.g. title or image
>> topic that is common between these two systems?
>
> It depends. Some metadata fields are available in more than one standard (we
> have basic support for Exif, IPTC and XMP), some are only available in one of
> those. Editable are only the 5 fields you can see in the metadata editor [0]
> and those are filled with whatever we find in any of the sources and stored to
> all places (at least Exif and XMP IIRC). That won't change after the rewrite
> of metadata handling, we will always put the same data into Exif, IPTC and XMP
> where possible.
This sounds good :)
>> 3) When developed raw images are exported, how much of the metadata is
>> stored within the exported image? How much as a sidecar file?
>
> That doesn't really make sense, exported images don't get a sidecar.
> Everything is embedded.
Depends. Some image tools also store sidecars for jpg and whatnot. I
think dt does as well if you ingest jpg instead of raw (ok, doesn't make
too much sense.)
But the point might be, that you probably want to clean some metadata
fields in certain exports and/or make sure that certain fields is not
passed on even though you store them locally for your data. An address
field if you post something on the wild web might be an example. Or a
(geo)location. Think of wildlife photography of some rare species e.g.
>> 4) What is the preferred way of saving text information about the place
>> (i.e. place names) where a photo was taken?
>
> You can't do that in darktable.
Thats a real dealbreaker, unfortunately. Searched this myself for quite
some time and reverted back to holding metadata outside of dt. Even if I
have nearly 100% geocoded stuff these fields are really missing.
>> 5) I am prepared to generate some text for inclusion in the user manual
>> so that other users have direct access to this information. Would this
>> be useful at all?
>
> Feel free to write something up, I just don't see what would be so interesting
> to include it in the user manual.
... unfortunately ...
--
Kind regards, / War is Peace.
| Freedom is Slavery.
Alexander Wagner | Ignorance is Strength.
|
| Theory : G. Orwell, "1984"
/ In practice: USA, since 2001
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